<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta
        name="viewport"
        content="width=device-width, initial-scale=1.0"
    >
    <title>AJAX JSON 响应</title>
    <style>
        #result {
            width: 200px;
            height: 100px;
            border: solid 1px #89b;
        }
    </style>
</head>


<body>
    <div id="result"></div>
    <script>
        const result = document.getElementById('result');
        //绑定键盘按下事件
        window.onkeydown = function () {
            // console.log('test');
            //发送请求
            const xhr = new XMLHttpRequest();
            //设置响应体的数据类型
            xhr.responseType = 'json';
            //初始化
            xhr.open('GET', 'http://127.0.0.1:8000/json-server')
            //发送、
            xhr.send();
            //事件绑定
            xhr.onreadystatechange = function () {
                //判断
                if (xhr.readyState === 4) {
                    if (xhr.status >= 200 && xhr.status < 300) {
                        // console.log(xhr.response);
                        // result.innerHTML = xhr.response;
                        //1. 手动对数据进行一个转换
                        // let data = JSON.parse(xhr.response);
                        // console.log(data);
                        // result.innerHTML = data.name;
                        //2. 自动转换:直接设置ajax响应数据类型
                        console.log(xhr.response);
                        result.innerHTML = xhr.response.name;


                    }

                }


            }


        }
    </script>


</body>

</html>